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Print edition: May 2004

Features

Dark energy

The evidence for gravitationally repulsive energy keeps getting stronger

Redefining the kilogram

Metrologists are searching for a more fundamental measure of mass

Physics in Action

Beating the diffraction limit

Negative-index materials continue to rewrite the laws of optics

Tales from the transneptunian sea

What lurks in the outer reaches of the Solar System?

Atoms and light get intimate

Quantum mechanics and the single atom

Lasers feel the Z-pinch

A novel way to produce high-temperature plasmas

Post-deadline

Smile for the camera

Nanofoam makes magnetic debut

Sonic boom for ultrasound imaging

News & Analysis

Gravity hunt goes underground

Magnetic imaging moves on

Gravity mission blasts off

French protests pay off

Superfluidity spotted in Fermi gas

Ireland bids to join club

US looks to nuclear power

US science adviser takes on his critics

Hubble successor shifts to the red

Astronomers should think globally

The man with an answer to everything

Water Cube

European research expands to the east

High hopes for high fields

India generates ion beams

Fusion reactor remains on hold

...while US re-examines cold fusion

Physicist turns to Tolkien

Editorial

New challenges for the EU

What does expansion mean for R&D?

Forum

Challenges for a new Europe

Critical Point

The greatest equations ever

What equations are great, and why?

Feedback

US threats to European journals

Reviews

Quantum theory: no problem

Brian Greene has written another best-seller

Warming to the story of climate change

The science behind the headlines

Why gravity always gets the last word

A spendid guide to everything in the universe

Lateral Thoughts

Visualizing the universe - part two